# proc_vmstat - virtual memory statistics - man(5) - [phpMan] [_proc_vmstat_(5)](https://www.chedong.com/phpMan.php/man/procvmstat/5/markdown) File Formats Manual [_proc_vmstat_(5)](https://www.chedong.com/phpMan.php/man/procvmstat/5/markdown) ## NAME /proc/vmstat - virtual memory statistics ## DESCRIPTION _/proc/vmstat_ (since Linux 2.6.0) This file displays various virtual memory statistics. Each line of this file contains a single name-value pair, delimited by white space. Some lines are present only if the kernel was configured with suitable options. (In some cases, the options required for particular files have changed across kernel versions, so they are not listed here. Details can be found by consulting the kernel source code.) The following fields may be present: _nr_free_pages_ (since Linux 2.6.31) _nr_alloc_batch_ (since Linux 3.12) _nr_inactive_anon_ (since Linux 2.6.28) _nr_active_anon_ (since Linux 2.6.28) _nr_inactive_file_ (since Linux 2.6.28) _nr_active_file_ (since Linux 2.6.28) _nr_unevictable_ (since Linux 2.6.28) _nr_mlock_ (since Linux 2.6.28) _nr_anon_pages_ (since Linux 2.6.18) _nr_mapped_ (since Linux 2.6.0) _nr_file_pages_ (since Linux 2.6.18) _nr_dirty_ (since Linux 2.6.0) _nr_writeback_ (since Linux 2.6.0) _nr_slab_reclaimable_ (since Linux 2.6.19) _nr_slab_unreclaimable_ (since Linux 2.6.19) _nr_page_table_pages_ (since Linux 2.6.0) _nr_kernel_stack_ (since Linux 2.6.32) Amount of memory allocated to kernel stacks. _nr_unstable_ (since Linux 2.6.0) _nr_bounce_ (since Linux 2.6.12) _nr_vmscan_write_ (since Linux 2.6.19) _nr_vmscan_immediate_reclaim_ (since Linux 3.2) _nr_writeback_temp_ (since Linux 2.6.26) _nr_isolated_anon_ (since Linux 2.6.32) _nr_isolated_file_ (since Linux 2.6.32) _nr_shmem_ (since Linux 2.6.32) Pages used by shmem and [**tmpfs**(5)](https://www.chedong.com/phpMan.php/man/tmpfs/5/markdown). _nr_dirtied_ (since Linux 2.6.37) _nr_written_ (since Linux 2.6.37) _nr_pages_scanned_ (since Linux 3.17) _numa_hit_ (since Linux 2.6.18) _numa_miss_ (since Linux 2.6.18) _numa_foreign_ (since Linux 2.6.18) _numa_interleave_ (since Linux 2.6.18) _numa_local_ (since Linux 2.6.18) _numa_other_ (since Linux 2.6.18) _workingset_refault_ (since Linux 3.15) _workingset_activate_ (since Linux 3.15) _workingset_nodereclaim_ (since Linux 3.15) _nr_anon_transparent_hugepages_ (since Linux 2.6.38) _nr_free_cma_ (since Linux 3.7) Number of free CMA (Contiguous Memory Allocator) pages. _nr_dirty_threshold_ (since Linux 2.6.37) _nr_dirty_background_threshold_ (since Linux 2.6.37) _pgpgin_ (since Linux 2.6.0) _pgpgout_ (since Linux 2.6.0) _pswpin_ (since Linux 2.6.0) _pswpout_ (since Linux 2.6.0) _pgalloc_dma_ (since Linux 2.6.5) _pgalloc_dma32_ (since Linux 2.6.16) _pgalloc_normal_ (since Linux 2.6.5) _pgalloc_high_ (since Linux 2.6.5) _pgalloc_movable_ (since Linux 2.6.23) _pgfree_ (since Linux 2.6.0) _pgactivate_ (since Linux 2.6.0) _pgdeactivate_ (since Linux 2.6.0) _pgfault_ (since Linux 2.6.0) _pgmajfault_ (since Linux 2.6.0) _pgrefill_dma_ (since Linux 2.6.5) _pgrefill_dma32_ (since Linux 2.6.16) _pgrefill_normal_ (since Linux 2.6.5) _pgrefill_high_ (since Linux 2.6.5) _pgrefill_movable_ (since Linux 2.6.23) _pgsteal_kswapd_dma_ (since Linux 3.4) _pgsteal_kswapd_dma32_ (since Linux 3.4) _pgsteal_kswapd_normal_ (since Linux 3.4) _pgsteal_kswapd_high_ (since Linux 3.4) _pgsteal_kswapd_movable_ (since Linux 3.4) _pgsteal_direct_dma_ _pgsteal_direct_dma32_ (since Linux 3.4) _pgsteal_direct_normal_ (since Linux 3.4) _pgsteal_direct_high_ (since Linux 3.4) _pgsteal_direct_movable_ (since Linux 2.6.23) _pgscan_kswapd_dma_ _pgscan_kswapd_dma32_ (since Linux 2.6.16) _pgscan_kswapd_normal_ (since Linux 2.6.5) _pgscan_kswapd_high_ _pgscan_kswapd_movable_ (since Linux 2.6.23) _pgscan_direct_dma_ _pgscan_direct_dma32_ (since Linux 2.6.16) _pgscan_direct_normal_ _pgscan_direct_high_ _pgscan_direct_movable_ (since Linux 2.6.23) _pgscan_direct_throttle_ (since Linux 3.6) _zone_reclaim_failed_ (since linux 2.6.31) _pginodesteal_ (since linux 2.6.0) _slabs_scanned_ (since linux 2.6.5) _kswapd_inodesteal_ (since linux 2.6.0) _kswapd_low_wmark_hit_quickly_ (since Linux 2.6.33) _kswapd_high_wmark_hit_quickly_ (since Linux 2.6.33) _pageoutrun_ (since Linux 2.6.0) _allocstall_ (since Linux 2.6.0) _pgrotated_ (since Linux 2.6.0) _drop_pagecache_ (since Linux 3.15) _drop_slab_ (since Linux 3.15) _numa_pte_updates_ (since Linux 3.8) _numa_huge_pte_updates_ (since Linux 3.13) _numa_hint_faults_ (since Linux 3.8) _numa_hint_faults_local_ (since Linux 3.8) _numa_pages_migrated_ (since Linux 3.8) _pgmigrate_success_ (since Linux 3.8) _pgmigrate_fail_ (since Linux 3.8) _compact_migrate_scanned_ (since Linux 3.8) _compact_free_scanned_ (since Linux 3.8) _compact_isolated_ (since Linux 3.8) _compact_stall_ (since Linux 2.6.35) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _compact_fail_ (since Linux 2.6.35) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _compact_success_ (since Linux 2.6.35) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _htlb_buddy_alloc_success_ (since Linux 2.6.26) _htlb_buddy_alloc_fail_ (since Linux 2.6.26) _unevictable_pgs_culled_ (since Linux 2.6.28) _unevictable_pgs_scanned_ (since Linux 2.6.28) _unevictable_pgs_rescued_ (since Linux 2.6.28) _unevictable_pgs_mlocked_ (since Linux 2.6.28) _unevictable_pgs_munlocked_ (since Linux 2.6.28) _unevictable_pgs_cleared_ (since Linux 2.6.28) _unevictable_pgs_stranded_ (since Linux 2.6.28) _thp_fault_alloc_ (since Linux 2.6.39) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_fault_fallback_ (since Linux 2.6.39) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_collapse_alloc_ (since Linux 2.6.39) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_collapse_alloc_failed_ (since Linux 2.6.39) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_split_ (since Linux 2.6.39) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_zero_page_alloc_ (since Linux 3.8) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _thp_zero_page_alloc_failed_ (since Linux 3.8) See the kernel source file _Documentation/admin-guide/mm/transhuge.rst_. _balloon_inflate_ (since Linux 3.18) _balloon_deflate_ (since Linux 3.18) _balloon_migrate_ (since Linux 3.18) _nr_tlb_remote_flush_ (since Linux 3.12) _nr_tlb_remote_flush_received_ (since Linux 3.12) _nr_tlb_local_flush_all_ (since Linux 3.12) _nr_tlb_local_flush_one_ (since Linux 3.12) _vmacache_find_calls_ (since Linux 3.16) _vmacache_find_hits_ (since Linux 3.16) _vmacache_full_flushes_ (since Linux 3.19) ## SEE ALSO [**proc**(5)](https://www.chedong.com/phpMan.php/man/proc/5/markdown) Linux man-pages 6.7 2023-08-15 [_proc_vmstat_(5)](https://www.chedong.com/phpMan.php/man/procvmstat/5/markdown)